Have SVGURIReference API deal with Document references, not pointers

Source/core/svg/SVGGlyphRefElement.cpp

Index: Source/core/svg/SVGGlyphRefElement.cpp
diff --git a/Source/core/svg/SVGGlyphRefElement.cpp b/Source/core/svg/SVGGlyphRefElement.cpp
index 618d0c9059c19aa73fb4e9cc2705e1c98c6f885f..4594e318d29cad4fd98e5d3f8cc8da5bd1da2c00 100644
--- a/Source/core/svg/SVGGlyphRefElement.cpp
+++ b/Source/core/svg/SVGGlyphRefElement.cpp
@@ -58,7 +58,7 @@ bool SVGGlyphRefElement::hasValidGlyphElement(String& glyphName) const
 {
     // FIXME: We only support xlink:href so far.
     // https://bugs.webkit.org/show_bug.cgi?id=64787
-    Element* element = targetElementFromIRIString(getAttribute(XLinkNames::hrefAttr), &document(), &glyphName);
+    Element* element = targetElementFromIRIString(getAttribute(XLinkNames::hrefAttr), document(), &glyphName);
     if (!element || !element->hasTagName(SVGNames::glyphTag))
         return false;
     return true;